F-27C Stryker - Beyond the Parkflyer - Page 511 - RC Groups
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Feb 11, 2010, 12:19 PM
Victim of C.D.O.
murdnunoc's Avatar
When I smoked an ESC with internal UBEC, I had control for about five seconds afterward. Almost enough time to land.

It all depends on where the burning goes after the motor side smokes. You may get lucky using internal BEC, but it's not something to count on.
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Feb 11, 2010, 02:05 PM
Quad Erat Demonstrandum
scousethief's Avatar
Wouldnt you be better off in that case using a small mah lipo into the batt socket of the rx ? the smaller the better obviously because of weight ? that way if the esc burns up at least you would have control over the servos to bring here home ? ( i am of course assuming that the B on my rx's means battery lol and that its an extra safety supply incase the esc does go down)
Feb 11, 2010, 02:49 PM
Victim of C.D.O.
murdnunoc's Avatar
Scousethief,
Yes, that is the safest way to ensure control after a main battery, ESC, or Motor failure. It gets the receiver and servo power completely removed from the propulsion power system.
It can either be done with a 4 or 5 cell NiMh battery, or a 2-3 cell small LiPo with a BEC wired inline. You must run the BEC with any Lipo since the full charged voltage of even the 2S pack is over what most servos can handle.

The separate battery is not for every application, as it does add extra weight. But for setups that you value highly, or for planes that can stand the extra weight of another battery, it is often worth it.
Feb 11, 2010, 05:13 PM
Yes, yes I am.
cjbucher's Avatar
Of course if your ESC burns up it could still shoot you down if it melts solder in such a way to short out the signal wire from your ESC to the receiver... Although rare but really anything can happen when electronics burn up...

Basically nothing is really truly bullet proof...
Feb 11, 2010, 05:51 PM
#who gives a rats a**?
feefo's Avatar
I've used 1 of thes before http://www.modelmaniacsonline.co.uk/...anCode=5509886 or there's this at 6v http://www.modelmaniacsonline.co.uk/...anCode=5509887 , with a small 2s lipo like this http://www.giantcod.co.uk/rcmodelpar...-p-403788.html , works great. Probabaly 1/2 the weight of a 4.8v ni-mh and the Rx and sevo's hardly take any juice from it either. I'm usually ok getting it in tho as I don't max out the battery compartment, and usually need to add nose weight too.
Feb 11, 2010, 05:57 PM
#who gives a rats a**?
feefo's Avatar
murdnunoc...when you fried your esc, was it on one of your powerful setups pulling lots of amps (to me)? If so, could it be that esc was so much hotter than say a 30 or 40 amp esc would get before that fried? I've fried a few esc's but always had control to land, but they were 30 and 40's. Or have I just been lucky?
Feb 11, 2010, 06:21 PM
efflux RC's Avatar
Just to let you guys know. I will be placing an order with Mega tomorrow.
If anyone still needs one let me know.
Since they are built to order, any of thier offered confugurations are available. Delivery to the USA is 30-40 days. Itn'l orders, 7-10 days additional.

Thanks, Gary
Latest blog entry: Updated blog - Oct 2017
Feb 11, 2010, 07:06 PM
Registered User
GryphonRCU's Avatar
efflux RC,

Hi Gary, 2 more friends are interested in MEGA motors.


Check your PM tomorrow before you get ready to place the order in case they have contacted you.


Later,

Gryphon
Feb 11, 2010, 08:40 PM
Registered User
customrcparts's Avatar
Got my 16/25/3c on order.

Gary is a really helpful guy!
Feb 11, 2010, 09:39 PM
Registered User
Quote:
Originally Posted by Ebolavoodoo
Thanks guys....on that note are you going down on prop size with stock motor and 4S or will 6x4 work?

Jerry
Stock 6x4 is fine, though I prefer the APC 6x4E. I noticed an improvement in both thrust and speed when I put the APC on. Very good performance for $2.19
Feb 11, 2010, 11:55 PM
Ebolavoodoo's Avatar
Quote:
Originally Posted by Unsullied_Spy
Stock 6x4 is fine, though I prefer the APC 6x4E. I noticed an improvement in both thrust and speed when I put the APC on. Very good performance for $2.19
Rodger that good buddy! Getting new airframe for modifications!
Feb 12, 2010, 12:54 AM
Victim of C.D.O.
murdnunoc's Avatar
Quote:
Originally Posted by feefo
murdnunoc...when you fried your esc, was it on one of your powerful setups pulling lots of amps (to me)? If so, could it be that esc was so much hotter than say a 30 or 40 amp esc would get before that fried? I've fried a few esc's but always had control to land, but they were 30 and 40's. Or have I just been lucky?
It was on a 50A ESC that I pulled 81A on accidentally.

That's a good point that a bigger ESC getting toasted could produce more BEC-burning heat than a smaller one. I still wouldn't trust it on something I put a lot of work into, unless I were being very conservative with the power system and staying well within the specified ratings for all components.
Feb 12, 2010, 07:12 AM
#who gives a rats a**?
feefo's Avatar
Agreed, better/more expensive planes deserve a seperate rx battery, just gives more piece of mind IMO.
Feb 12, 2010, 07:25 AM
#who gives a rats a**?
feefo's Avatar
If anyone is thinking of using a lipo & regulator, this is handy too http://cgi.ebay.co.uk/Li-Po-Battery-...item3ef6009ddc . Wouldn't swear it's THAT acurate (never checked against my Imax) but they are handy when at the field.
Feb 12, 2010, 07:28 AM
Quad Erat Demonstrandum
scousethief's Avatar
Theyre ok , give the same reading as my multimeter


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